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Commitments and Contingencies Commitments and Contingencies - Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Leases      
Operating lease expense $ 97 $ 92 $ 90
2018 50    
CT and QTE outstanding leaseback obligation 263 $ 301  
2018 53    
2018 76    
2019 75    
2020 60    
2021 12    
2022 3    
Thereafter 2    
Total 228    
2019 53    
2020 53    
2021 55    
2022 51    
Thereafter 418    
Total 683    
Less: amount representing interest (495)    
Total 188    
2019 207    
2020 25    
2021 0    
2022 0    
Thereafter 0    
Total $ 282